1
|
W-Band Modular Antenna/Detector Array for the Electron Cyclotron Emission Imaging System in KSTAR. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12052431] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A design of a modular antenna/detector array for the electron cyclotron emission (ECE) imaging system at the Korea Superconducting Tokamak Advanced Research (KSTAR) is proposed. The modular antenna/detector array is based on a unit antenna/detector module, which consists of an elliptical mini-lens, a dual-dipole antenna, an antenna balun, a low-noise amplifier, and a metal frame. The proposed modular antenna/detector array resolves the problem in the conventional antenna/detector array where one faulty channel requires the entire array to be removed for the service. With the proposed modular array, each channel module can be easily and independently removed and replaced without interference to the rest of the array, thus minimizing the interrupted service time for maintenance. Moreover, the unit channel modules can be efficiently updated under a variety of the tokamak operation conditions. The antenna/detector modules are optimized to have improved performance, and are tested in a W-band test setup, and consistently provide the gain increase by 10~20 dB as compared with the conventional antenna/detector array. A set of the proposed modular antenna/detector array is currently installed and tested in the KSTAR ECE imaging system, and will consistently produce the improved ECE imaging to monitor MHD instability activities under various plasma operation conditions.
Collapse
|
2
|
Lee GH, Kumar S, Choi HC, Kim KW. Wideband High-Gain Double-Sided Dielectric Lens Integrated With a Dual-Bowtie Antenna. IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 2021; 20:293-297. [DOI: 10.1109/lawp.2020.3048165] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2023]
|
3
|
Lee GH, Kim DH, Mohyuddin W, Kumar S, Choi HC, Kim KW. Wideband bended CPS‐to‐microstrip transition for millimeter‐wave antenna‐detector module. MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2020; 62:1991-1996. [DOI: 10.1002/mop.32255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Accepted: 01/08/2020] [Indexed: 10/24/2023]
Abstract
AbstractIn this article, the design of a new compact transition with two bended structures for millimeter‐wave (W/F‐band) antenna‐detector module is presented. The millimeter‐wave antenna is a dual dipole antenna fed by a coplanar stripline (CPS). Due to small size of the antenna‐detector, the CPS line impedance tends to be very high (~160 Ω). The down‐converted broadband microwave signal in the CPS is channeled to a 50 Ω microstrip line using a CPS‐to‐microstrip line transition (balun). If the start frequency of the transition is low, the conventional straight balun tends to be very long. In order to reduce transition length, the transition with bended parts while optimizing the impedance tapering based on the analytical formulas (conformal mapping) is chosen. In the proposed transition design, a transition with two bends in 120° is designed and implemented. The measured results show the maximum insertion loss of 1.5 dB in the frequency range of 1.8 to 17.8 GHz. Also, the return loss of the proposed transition is greater than 10 dB from 1.8 to 20 GHz.
Collapse
Affiliation(s)
- Gwan Hui Lee
- School of Electronics Engineering Kyungpook National University Daegu Republic of Korea
| | - Dong Hwi Kim
- School of Electronics Engineering Kyungpook National University Daegu Republic of Korea
| | - Wahab Mohyuddin
- Research Institute for Microwave and Millimeter‐Wave Studies, National University of Sciences and Technology Islamabad Pakistan
| | - Sachin Kumar
- School of Electronics Engineering Kyungpook National University Daegu Republic of Korea
| | - Hyun Chul Choi
- School of Electronics Engineering Kyungpook National University Daegu Republic of Korea
| | - Kang Wook Kim
- School of Electronics Engineering Kyungpook National University Daegu Republic of Korea
| |
Collapse
|
4
|
Yang Z, Zhou J, Pan X, Cao J, Yu G, Domier C, Zhu Y, Chang F, Zhang Z, Gao Y, Luhmann N, Xie X. Development of intelligent control module for the J-TEXT electron cyclotron emission imaging system. FUSION ENGINEERING AND DESIGN 2020. [DOI: 10.1016/j.fusengdes.2020.111494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
5
|
Sabot R, Giacalone JC, Nam Y, Berne A, Brun C, Elbèze D, Faisse F, Gargiulo L, Kim M, Lee W, Lotte P, Park HK, Santraine B, Yun G. Development of Microwave Imaging Diagnostics for WEST Tokamak. JOURNAL OF FUSION ENERGY 2019. [DOI: 10.1007/s10894-019-00216-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
6
|
Nam YB, Park HK, Lee W, Yun GS, Kim M, Sabot R, Elbeze D, Lotte P, Shen J. Compact ECEI system with in-vessel reflective optics for WEST. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:11E135. [PMID: 27910691 DOI: 10.1063/1.4962941] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
An electron cyclotron emission imaging (ECEI) diagnostic system for WEST (W Environment for Steady state Tokamak) is under development to study the MHD instabilities affected by tungsten impurities. The system will provide 2-D Te fluctuation images (width × height = ∼18 cm × ∼ 34 cm at low field side and ∼13 cm × ∼ 39 cm at high field side) from a poloidal cross section with high spatial (≤1.7 cm) and temporal (≤2 μs) resolutions. While the key concept and electronic structure are similar to that of prior ECEI systems on other tokamak devices such as KSTAR, DIII-D, or ASDEX-U, part of the imaging optics have to be placed inside the vacuum vessel in order to resolve issues on limited installation space and longer beam path to the detector position. The in-vessel optics consisting of two large curvature-radius mirrors are expected to withstand the extreme heating on long-pulse operation scenario (∼1000 s). The out-vessel optical housing is constructed as compact as possible to remove easily from the installation site in case of necessity. Commissioning of the system is scheduled on the second experimental WEST campaign end of 2017.
Collapse
Affiliation(s)
- Y B Nam
- Department of Physics, Pohang University of Science and Technology, Pohang 37673, South Korea
| | - H K Park
- Ulsan National Institute of Science and Technology, Ulsan 44919, South Korea
| | - W Lee
- Ulsan National Institute of Science and Technology, Ulsan 44919, South Korea
| | - G S Yun
- Department of Physics, Pohang University of Science and Technology, Pohang 37673, South Korea
| | - M Kim
- Ulsan National Institute of Science and Technology, Ulsan 44919, South Korea
| | - R Sabot
- CEA, IRFM, F-13108 Saint Paul lez Durance, France
| | - D Elbeze
- CEA, IRFM, F-13108 Saint Paul lez Durance, France
| | - P Lotte
- CEA, IRFM, F-13108 Saint Paul lez Durance, France
| | - J Shen
- CEA, IRFM, F-13108 Saint Paul lez Durance, France
| |
Collapse
|
7
|
Nam YB, Lee DJ, Lee J, Kim C, Yun GS, Lee W, Park HK. New compact and efficient local oscillator optic system for the KSTAR electron cyclotron emission imaging system. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:11E130. [PMID: 27910535 DOI: 10.1063/1.4961290] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Electron cyclotron emission imaging (ECEI) diagnostic on Korean Superconducting Tokamak Advanced Research utilizes quasi-optical heterodyne-detection method to measure 2D (vertical and radial) Te fluctuations from two toroidally separated poloidal cross section of the plasma. A cylindrical lens local oscillator (LO) optics with optical path length (OPL) 2-2.5 m has been used in the current ECEI system to couple the LO source to the 24 vertically aligned array of ECE detectors. For efficient and compact LO optics employing the Powell lens is proposed so that the OPL of the LO source is significantly reduced from ∼2.0 m to 0.4 m with new optics. The coupling efficiency of the LO source is expected to be improved especially at the edge channels. Results from the optical simulation together with the laboratory test of the prototype optics will be discussed in this paper.
Collapse
Affiliation(s)
- Y B Nam
- Department of Physics, Pohang University of Science and Technology, Pohang 37673, South Korea
| | - D J Lee
- Ulsan National Institute of Science and Technology, Ulsan 44919, South Korea
| | - J Lee
- Ulsan National Institute of Science and Technology, Ulsan 44919, South Korea
| | - C Kim
- Pennsylvania State University, Old Main, State College, Pennsylvania 16801, USA
| | - G S Yun
- Department of Physics, Pohang University of Science and Technology, Pohang 37673, South Korea
| | - W Lee
- Ulsan National Institute of Science and Technology, Ulsan 44919, South Korea
| | - H K Park
- Ulsan National Institute of Science and Technology, Ulsan 44919, South Korea
| |
Collapse
|
8
|
Zhongbing S, Min J, Yonglong C, Bin W, Yong Y, Lin M, Wulu Z, Wei C, Peiwan S, Zhetian L, Binzhong F, Xuantong D, Yi L, Qingwei Y, Xuru D. Development of microwave imaging reflectometry on the HL-2A tokamak. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:11D816. [PMID: 25430229 DOI: 10.1063/1.4889741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A microwave imaging reflectometry system has been developed to visualize the density fluctuations on the HL-2A tokamak. This system is characterized by a quasi-optical system, a four frequency microwave transmitter, and a microwave quadrature receiver system with a 3D adjustable U-shaped horn antenna array, that generate 8 (poloidal) × 4 (radial) × 2 (toroidal) = 64 channel images of density fluctuations. Simulations and laboratory tests of the optical system have been conducted. The test results are in good agreement with the simulations.
Collapse
Affiliation(s)
- Shi Zhongbing
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Jiang Min
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Che Yonglong
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Wang Bin
- School of Physical Electronics, University of Electronics Science and Technology of China, Chengdu 610054, China
| | - Yin Yong
- School of Physical Electronics, University of Electronics Science and Technology of China, Chengdu 610054, China
| | - Meng Lin
- School of Physical Electronics, University of Electronics Science and Technology of China, Chengdu 610054, China
| | - Zhong Wulu
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Chen Wei
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Shi Peiwan
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Liu Zhetian
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Fu Binzhong
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Ding Xuantong
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Liu Yi
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Yang Qingwei
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Duan Xuru
- Southwestern Institute of Physics, Chengdu 610041, China
| |
Collapse
|
9
|
Zhu Y, Zhao Z, Liu WD, Xie J, Hu X, Muscatello CM, Domier CW, Luhmann NC, Chen M, Ren X, Tobias BJ, Zhuang G, Yang Z. Optics design for J-TEXT ECE imaging with field curvature adjustment lens. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:11D854. [PMID: 25430267 DOI: 10.1063/1.4893352] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Significant progress has been made in the imaging and visualization of magnetohydrodynamic and microturbulence phenomena in magnetic fusion plasmas. Of particular importance has been microwave electron cyclotron emission imaging (ECEI) for imaging Te fluctuations. Key to the success of ECEI is a large Gaussian optics system constituting a major portion of the focusing of the microwave radiation from the plasma to the detector array. Both the spatial resolution and observation range are dependent upon the imaging optics system performance. In particular, it is critical that the field curvature on the image plane is reduced to decrease crosstalk between vertical channels. The receiver optics systems for two ECEI on the J-TEXT device have been designed to ameliorate these problems and provide good performance with additional field curvature adjustment lenses with a meniscus shape to correct the aberrations from several spherical surfaces.
Collapse
Affiliation(s)
- Y Zhu
- School of Physics, University of Science and Technology of China, Anhui 230026, People's Republic of China
| | - Z Zhao
- School of Physics, University of Science and Technology of China, Anhui 230026, People's Republic of China
| | - W D Liu
- School of Physics, University of Science and Technology of China, Anhui 230026, People's Republic of China
| | - J Xie
- School of Physics, University of Science and Technology of China, Anhui 230026, People's Republic of China
| | - X Hu
- University of California at Davis, Davis, California 95616, USA
| | - C M Muscatello
- University of California at Davis, Davis, California 95616, USA
| | - C W Domier
- University of California at Davis, Davis, California 95616, USA
| | - N C Luhmann
- University of California at Davis, Davis, California 95616, USA
| | - M Chen
- University of California at Davis, Davis, California 95616, USA
| | - X Ren
- University of California at Davis, Davis, California 95616, USA
| | - B J Tobias
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
| | - G Zhuang
- College of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Z Yang
- College of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| |
Collapse
|
10
|
Jiang M, Shi ZB, Che S, Domier CW, Luhmann NC, Hu X, Spear A, Liu ZT, Ding XT, Li J, Zhong WL, Chen W, Che YL, Fu BZ, Cui ZY, Sun P, Liu Y, Yang QW, Duan XR. Development of electron cyclotron emission imaging system on the HL-2A tokamak. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2013; 84:113501. [PMID: 24289395 DOI: 10.1063/1.4828671] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A 2D electron cyclotron emission imaging (ECEI) system has been developed for measurement of electron temperature fluctuations in the HL-2A tokamak. It is comprised of a front-end 24 channel heterodyne imaging array with a tunable RF range spanning 75-110 GHz, and a set of back-end ECEI electronics that together generate 24 × 8 = 192 channel images of the 2nd harmonic X-mode electron cyclotron emission from the HL-2A plasma. The simulated performance of the local oscillator (LO) optics and radio frequency (RF) optics is presented, together with the laboratory characterization results. The Gaussian beams from the LO optics are observed to properly cover the entire detector array. The ECE signals from the plasma are mixed with the LO signal in the array box, then delivered to the electronics system by low-loss microwave cables, and finally to the digitizers. The ECEI system can achieve temporal resolutions of ~μs, and spatial resolutions of 1 cm (radially) and 2 cm (poloidally).
Collapse
Affiliation(s)
- M Jiang
- Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Tobias BJ, Classen IGJ, Domier CW, Heidbrink WW, Luhmann NC, Nazikian R, Park HK, Spong DA, Van Zeeland MA. Fast ion induced shearing of 2D Alfvén eigenmodes measured by electron cyclotron emission imaging. PHYSICAL REVIEW LETTERS 2011; 106:075003. [PMID: 21405522 DOI: 10.1103/physrevlett.106.075003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2010] [Indexed: 05/30/2023]
Abstract
Two-dimensional images of electron temperature perturbations are obtained with electron cyclotron emission imaging (ECEI) on the DIII-D tokamak and compared to Alfvén eigenmode structures obtained by numerical modeling using both ideal MHD and hybrid MHD-gyrofluid codes. While many features of the observations are found to be in excellent agreement with simulations using an ideal MHD code (NOVA), other characteristics distinctly reveal the influence of fast ions on the mode structures. These features are found to be well described by the nonperturbative hybrid MHD-gyrofluid model TAEFL.
Collapse
Affiliation(s)
- B J Tobias
- University of California, Davis, 95616, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Classen IGJ, Boom JE, Suttrop W, Schmid E, Tobias B, Domier CW, Luhmann NC, Donné AJH, Jaspers RJE, de Vries PC, Park HK, Munsat T, García-Muñoz M, Schneider PA. 2D electron cyclotron emission imaging at ASDEX Upgrade (invited). THE REVIEW OF SCIENTIFIC INSTRUMENTS 2010; 81:10D929. [PMID: 21033957 DOI: 10.1063/1.3483214] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The newly installed electron cyclotron emission imaging diagnostic on ASDEX Upgrade provides measurements of the 2D electron temperature dynamics with high spatial and temporal resolution. An overview of the technical and experimental properties of the system is presented. These properties are illustrated by the measurements of the edge localized mode and the reversed shear Alfvén eigenmode, showing both the advantage of having a two-dimensional (2D) measurement, as well as some of the limitations of electron cyclotron emission measurements. Furthermore, the application of singular value decomposition as a powerful tool for analyzing and filtering 2D data is presented.
Collapse
Affiliation(s)
- I G J Classen
- Max Planck Institut für Plasmaphysik, 85748 Garching, Germany.
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Kong X, Domier CW, Luhmann NC. Antenna development for high field plasma imaging. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2010; 81:10D923. [PMID: 21033955 DOI: 10.1063/1.3479117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Electron cyclotron emission imaging (ECEI) and microwave imaging reflectometry (MIR) are two microwave nonperturbing plasma visualization techniques that employ millimeter-wave imaging arrays with lens-coupled planar antennas, yielding time-resolved images of temperature (via ECEI) and electron density (via MIR) fluctuations within high temperature magnetic fusion plasmas. A series of new planar antennas have been developed that extend this technology to frequencies as high as 220 GHz for use on high field plasma devices with toroidal fields in excess of 3 T. Antenna designs are presented together with theoretical calculations, simulations, and experimental measurements.
Collapse
Affiliation(s)
- X Kong
- Department of Applied Science, University of California at Davis, Davis, California 95616, USA
| | | | | |
Collapse
|
14
|
Kim JB, Lee W, Yun GS, Park HK, Domier CW, Luhmann NC. Data acquisition and processing system of the electron cyclotron emission imaging system of the KSTAR tokamak. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2010; 81:10D931. [PMID: 21033959 DOI: 10.1063/1.3479023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A new innovative electron cyclotron emission imaging (ECEI) diagnostic system for the Korean Superconducting Tokamak Advanced Research (KSTAR) produces a large amount of data. The design of the data acquisition and processing system of the ECEI diagnostic system should consider covering the large data production and flow. The system design is based on the layered structure scalable to the future extension to accommodate increasing data demands. Software architecture that allows a web-based monitoring of the operation status, remote experiment, and data analysis is discussed. The operating software will help machine operators and users validate the acquired data promptly, prepare next discharge, and enhance the experiment performance and data analysis in a distributed environment.
Collapse
Affiliation(s)
- J B Kim
- Department of Physics, POSTECH, San-31, Hyoja-dong, Nam-gu, Pohang, Kyungbuk 790-784, South Korea.
| | | | | | | | | | | |
Collapse
|
15
|
Yun GS, Lee W, Choi MJ, Kim JB, Park HK, Domier CW, Tobias B, Liang T, Kong X, Luhmann NC, Donné AJH. Development of KSTAR ECE imaging system for measurement of temperature fluctuations and edge density fluctuations. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2010; 81:10D930. [PMID: 21033958 DOI: 10.1063/1.3483209] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The ECE imaging (ECEI) diagnostic tested on the TEXTOR tokamak revealed the sawtooth reconnection physics in unprecedented detail, including the first observation of high-field-side crash and collective heat transport [H. K. Park, N. C. Luhmann, Jr., A. J. H. Donné et al., Phys. Rev. Lett. 96, 195003 (2006)]. An improved ECEI system capable of visualizing both high- and low-field sides simultaneously with considerably better spatial coverage has been developed for the KSTAR tokamak in order to capture the full picture of core MHD dynamics. Direct 2D imaging of other MHD phenomena such as tearing modes, edge localized modes, and even Alfvén eigenmodes is expected to be feasible. Use of ECE images of the optically thin edge region to recover 2D electron density changes during L/H mode transitions is also envisioned, providing powerful information about the underlying physics. The influence of density fluctuations on optically thin ECE is discussed.
Collapse
Affiliation(s)
- G S Yun
- Pohang University of Science and Technology, Pohang, Gyungbuk 790-784, South Korea.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Tobias B, Domier CW, Liang T, Kong X, Yu L, Yun GS, Park HK, Classen IGJ, Boom JE, Donné AJH, Munsat T, Nazikian R, Van Zeeland M, Boivin RL, Luhmann NC. Commissioning of electron cyclotron emission imaging instrument on the DIII-D tokamak and first data. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2010; 81:10D928. [PMID: 21033956 DOI: 10.1063/1.3460456] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A new electron cyclotron emission imaging diagnostic has been commissioned on the DIII-D tokamak. Dual detector arrays provide simultaneous two-dimensional images of T(e) fluctuations over radially distinct and reconfigurable regions, each with both vertical and radial zoom capability. A total of 320 (20 vertical×16 radial) channels are available. First data from this diagnostic demonstrate the acquisition of coherent electron temperature fluctuations as low as 0.1% with excellent clarity and spatial resolution. Details of the diagnostic features and capabilities are presented.
Collapse
Affiliation(s)
- B Tobias
- University of California at Davis, Davis, California 95616, USA.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Tobias B, Kong X, Liang T, Spear A, Domier CW, Luhmann NC, Classen IGJ, Boom JE, van de Pol MJ, Jaspers R, Donné AJH, Park HK, Munsat T. Advancements in electron cyclotron emission imaging demonstrated by the TEXTOR ECEI diagnostic upgrade. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2009; 80:093502. [PMID: 19791937 DOI: 10.1063/1.3233913] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A new TEXTOR electron cyclotron emission imaging system has been developed and employed, providing a diagnostic with new features and enhanced capabilities when compared to the legacy system it replaces. Optical coupling to the plasma has been completely redesigned, making use of new minilens arrays for reduced optical aberration and providing the new feature of vertical zoom, whereby the vertical coverage is now remotely adjustable on a shot-by-shot basis from 20-35 cm. Other innovations, such as the implementation of stacked quasioptical planar notch filters, allow for the diagnostic to be operated without interruption or degradation in performance during electron cyclotron resonance heating. Successful commissioning of the new diagnostic and a demonstration of the improved capabilities are presented in this paper, along with a discussion of the new technologies employed.
Collapse
Affiliation(s)
- B Tobias
- University of California at Davis, Davis, California 95616, USA
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|